ECD SYSTEM (w/ DPF) MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. When the ignition switch is turned to ON, power is supplied to the MIL circuit, and the ECM provides the circuit ground which illuminates the MIL.

The MIL operation can be checked visually: When the ignition switch is turned to ON, the MIL should be illuminated and should turn off after engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the GTS.

WIRING DIAGRAM

A003ERQE06

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK THAT MIL IS ILLUMINATED


    1. Perform troubleshooting in accordance with the table below.

      Result
      Result Condition Proceed to
      ON → OFF Ignition switch ON → engine is started A
      MIL does not illuminate Engine does not start B
      MIL remains ON - C

    B

    GO TO VC OUTPUT CIRCUIT Click here

    C

    CHECK WHETHER DTC OUTPUT RECURS Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

  2. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    5. Check if any DTCs have been detected. Note down any DTCs.

      Result
      Result Proceed to
      DTC is not output A
      Any DTCs is output B

      Tech Tips

      Check for detected DTCs output from other ECUs which relate to the MIL.


    B

    REPAIR CIRCUIT INDICATED BY OUTPUT DTC

    A

  3. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Combination Meter / Active Test / Check Engine Indicator.

    5. Check the status of the MIL while performing the Active Test.

      Result
      Result Proceed to
      Changes A
      Does not change B

    B

    REPLACE COMBINATION METER ASSEMBLY Click here

    A

    REPLACE ECM Click here